Access output files thru providers in Soong tests.

The outputFiles field on ModuleBase will be removed next.

Bug: 358425833
Test: CI
Change-Id: I6d665ac13134d9278e5908f64c454366bc6bca5e
diff --git a/java/aar_test.go b/java/aar_test.go
index 877e2c7..aa4f0af 100644
--- a/java/aar_test.go
+++ b/java/aar_test.go
@@ -159,9 +159,9 @@
 	bar := result.ModuleForTests("bar", "android_common")
 	baz := result.ModuleForTests("baz", "android_common")
 
-	fooOutputPaths := foo.OutputFiles(t, "")
-	barOutputPaths := bar.OutputFiles(t, "")
-	bazOutputPaths := baz.OutputFiles(t, "")
+	fooOutputPaths := foo.OutputFiles(result.TestContext, t, "")
+	barOutputPaths := bar.OutputFiles(result.TestContext, t, "")
+	bazOutputPaths := baz.OutputFiles(result.TestContext, t, "")
 
 	android.AssertPathsRelativeToTopEquals(t, "foo output path",
 		[]string{"out/soong/.intermediates/foo/android_common/withres/foo.jar"}, fooOutputPaths)